Compass-handle-adjusting device.



PATENTED MAY 21, 1907.

0. G. MAYER. COMPASS HANDLE ADJUSTING DEVIGE.

APELIUATION FILED FEB. 7, 1907.

Wm-NEssEs,

INVENTER, OTTO G, M R,

UNITED STATES PATENT OFFICE.

COMPASS-HANDLE-ADJUSTING DEVICE.

Specification of Letters Patent.

Patented May 21, 1907.

J w zlication filed February 7,1907. Serial No. 356,215.

To all whom it may concern:

Be it known that I, OTTO G. MAYER, a citizen of the German Empire, residing at Stutttheir pivots or axes of rotation, through gart, in the Kingdom of \Vurtemberg, Empire of Germany, have invented certain new and useful Improvements in Compass-Handle-Adjusting Devices; and I do hereby declare the following to be a full, clear, and ex act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the device in compasses for the automatic adjustment of the handle into the middle position described in patent Serial No. 323,006 of 23rd June 1906, the adjustment into the middle position of the compass handle is effected by means of two disks arranged between the compass heads, these disks which are located symmetrically eccentrically to the compass heads, being pivotally connected together by a common pin and having an arm engaging in the hollow compass handle and displaceable therein.

The object of the present invention is an improved form of construction of this arrangement, whereby the similarly eccentrically mounted disks, without being connected with one another, engage by means of small arms in a recess in the lower part of the compass head and adjust this automatically into the middle position. This is done by the disks having slots lying concentrically to which slots the wire pin connecting the two compass heads passes. In consequence of this arrangement a connection of the two disks and an arm pivoted on the latter is unnecessary, and also it is not necessary to make the handle hollow, but only to have a recess in the lower part of the same.

The object of the invention is shown in connection with a compass in Figures 16 of the accompanying drawings Figs. 1 and 2- are two viewsturned at 90 to one another of the improved adjusting device with the compass closed Fig. 3 is a view with the instrument partly open Fig. 4, asection of the handle and compass head; Fig. 5 an elevation of the partially opened compass with the handle yoke assumed to be removed; and Fig. 6, a detail view of one of the two disks lying eccentrically located between the compass heads.

As already mentioned in the opening paragraph, the two disks e are revolubly mounted on pins (Z arranged symmetrically eccentrically to the two compass heads I), and have segmental slots 7', lying concentrically to these pins, through which slots the pin 0 connecting the two compass heads passes. Each disk has an arm f engaging in the recess h of the compass handle 9. Now as soon as the compass is opened, the two eccentrically mounted disks e are displaced radially against the pivot c in such a way that the two ends of their arms f are always located in the middle line of the compass arm, whereby also the compass handle g is held in each position of adjustment of the two compass arms in the center line of the same.

I declare that what I claim is A compass or the like having pivoted compass-heads and a handle provided with a recess at its lower part, in combination with means for automatic adjustment of said handle into the middle position, and comprising two rotatable disks provided with radially projecting arms which engage in said recess of the handle, and both disks being symmetrically eccentrically pivoted between said compass heads and close to one another, each disk having a slot lying concentrically to the pivot of rotation thereof and the pivot of the compass heads passing through the slots in the disks.

In testimony whereof I afliX my signature, in presence of two witnesses.

OTTO G. MAYER.

Witnesses HERM. HoPPE, ERNST ENTENMANN. 

